package com.zy.mobile.message.push.nio;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;

public class NioTimeClientHandle implements Runnable{
	
	private String host;
	
	private int port;
	
	private Selector selector;
	
	private SocketChannel socketChannel;
	
	private volatile boolean stop;
	
	public NioTimeClientHandle(String host,int port) {
		// TODO Auto-generated constructor stub
		this.host = host == null ? "127.0.0.1" : host;
		this.port = port;
		try {
			selector = Selector.open();
			socketChannel = SocketChannel.open();
			socketChannel.configureBlocking(false);
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
			System.exit(1);
		}
	}
	
	@Override
	public void run() {
		// TODO Auto-generated method stub
		try {
			doConnect();
		} catch (Exception e) {
			// TODO: handle exception
		}
		
		while(!stop){
			try {
				selector.select(1000);
				Set<SelectionKey> selectedKeys = selector.selectedKeys();
				Iterator <SelectionKey> it = selectedKeys.iterator();
				SelectionKey key = null;
				while(it.hasNext()){
					key = it.next();
					it.remove();
					try {
						handleInput(key);
					} catch (Exception e) {
						// TODO: handle exception
					}
				}
			} catch (Exception e){
				// TODO: handle exception
			}
		}
	}
	
	private void doConnect() throws IOException{
		if(socketChannel.connect(new InetSocketAddress(host,port))){
			socketChannel.register(selector,SelectionKey.OP_READ);
			doWrite(socketChannel);
		}else{
			socketChannel.register(selector,SelectionKey.OP_CONNECT);
		}
	}
	
	private void doWrite(SocketChannel sc)throws IOException{
		byte[] req = "QUERY TIME ORDER".getBytes();
		ByteBuffer writeBuffer = ByteBuffer.allocate(req.length);
		writeBuffer.put(req);
		writeBuffer.flip();
		sc.write(writeBuffer);
		if(!writeBuffer.hasRemaining()){
			System.out.println("send order to server succed.");
		}
	}
	
	private void handleInput(SelectionKey key) throws IOException{
		if(key.isValid()){
			//判断是否连接成功
			SocketChannel sc = (SocketChannel) key.channel();
			if(key.isConnectable()){
				if(sc.finishConnect()){
					sc.register(selector,SelectionKey.OP_READ);
					doWrite(sc);
				}else{
					System.out.println("连接失败 进程退出");
					System.exit(1);//连接失败 进程退出
				}
			}
			if(key.isReadable()){
				ByteBuffer readBuffer = ByteBuffer.allocate(1024);
				int readBytes = sc.read(readBuffer);
				if(readBytes > 0){
					readBuffer.flip();
					byte[] bytes = new byte[readBuffer.remaining()];
					readBuffer.get(bytes);
					String body = new String(bytes,"UTF-8");
					System.out.println("Now is : "+body);
					this.stop = true;
				}else if(readBytes < 0){
					//对端链路关闭
					key.cancel();
					sc.close();
				}else{
					//读到0字节 忽略
				}
			}
		}
	}
}
